PMC:7781500 / 521-572
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T8","span":{"begin":2,"end":9},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":".\nMethods\nWe enrolled 379 healthcare workers, hospi"}